Variants of rectifiers with near sinusoidal input currents - a comparative analysis with the conventional diode rectifier

Based on the characteristics of the rectifiers with near sinusoidal input currents [rectifier with near sinusoidal input current-1 (RNSIC-1), with capacitors connected on the DC side and RNSIC-2, with capacitors connected on the AC side], the study proposes a comparative analysis between the performances (generated capacitive current, costs, efficiency, dimensions and other considerations) of the two variants of RNSIC converters with three-phase six-pulse full-bridge diode rectifiers with passive filters. Therefore the technical and economical advantages of the RNSIC converters are demonstrated. The inductors and the capacitors of the RNSIC converters do not belong to the category of resonant circuits tuned to specific frequency. This is the reason why the design requirements for the capacitors are not very stringent as they can have a tolerance range of ±10% without inflicting severe performance degradations. These converters can be used for a wide power range, practically mitigating the current harmonics generated by a three-phase diode rectifier, without being influenced by the harmonics generated by other consumers.